Jack.



PATENTED MAY 22, 1906 J. W. HEARN.

JACK.

APPLICATION FILED JAN. 4, 1906.

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-UNITED STATES PATENT @FFICE. I

JAMEs W. HEAEN, OF MUaEaEEsBoEo, TENNESSEE.

JACK.

Specification of Letters Patent.

Eatented May 22, 1906.

To all whom it may concern.-

Be it known that 1, JAMES, W. HEARN, a citizen of the United States, residing at Murfreesboro, in the county of Rutherford, State of Tennessee, have invented certain new and useful Improvements in Jacks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to jacks, and more particularly to lever-jacks, and has for its object to provide a jack which will be simple and cheap and which maybe made from ordinary stock material. Another object is to provide a'jack combining the above qualities with great lifting power.

Other objects and advantages will be apparent from the following description.

In the drawings forming a portion of this specification, and in which like numerals of reference indicate similar parts in both the views, .Figure 1 is a side elevation of the present jack in use. Fig. 2 is a view similar to Fig. 1 with the plates at one side removed.

Referring now to the drawings, the present invention comprises an upright 5, having a foot 6 at its lower end and series of notches 7 and 8, respectively, in its side edges, the

notches of one series being located opposite to the spaces of the other. Horizontal spaced plates 9 are disposed at opposite sides of the upright 5, and secured at their lower ends between the portions of the plates 9,

which extend beyond the upright, there are the upright and parallel therewith. An operating-lever 13 is-bifurcated at its inner end to form spaced portions 14, the major trans verse dimensions of which extend vertically, as does also the transverse dimension of the bifurcation, and this lever is disposed with its spaced portions 14 at opposite sides of the upright 5 and in the spaces between this upright and the members 12 the bow 10 which does not carry the finger 10 lying within the bifurcation. The outer ends of the spaced portions 14 project beyond the upright 5, and pivoted therebetween there is a depending dog 15, arranged for engagement in the notches of the series 8, while a similar dog 16 is pivoted between the portions 14 at the opposite side ofthe upright and is arranged for engagement of the notches 7. Pivot-bolts 17 are engaged in the members 12 and in the spaced portions 14, and it will be seen'that the lever 13 may be moved upon these pivotbolts to engage the dogs 15 and 16 with the notches of their respective series successively and that what way be termed the head 18 of the jack will be raised, this head consisting of the bows, plates, the finger 10, and all portions which are slidably mounted upon the upright, as just described.

Chains 15 and 16 are connected with the dogs 15 and 16, respectively, and may be 0perated to disengage the dogs from their respective notches to permit of downward movement of the head 18.

What is claimed is- A jack comprising an upright having notches in its opposite edges, upper and lower pairs of plates disposed at opposite sides of the upright and extending laterally therebeyond, vertical members secured at their ends to the corresponding upper and lower plates and lying parallel with the upright and in spaced relation thereto, oppositely-extending bows secured between the laterally-extending portions of the plates with their concavities directed inwardly, one of said bows having an outwardly-extending load-receiving finger at its upper end, an operating-lever having a bifurcated inner end disposed with its spaced portions at the opposite sides of the upright and in the spaces between the upright and the vertical members, said spaced portions extending beyond the upright in opposite directions, pivot-pins engaged in the vertical members and in the spaced portions, depending dogs pivoted between the spaced portions at opposite sides of the upright and arranged for engagement 

